D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
D01F 6/30 (2006.01) D01F 1/10 (2006.01) D01F 6/06 (2006.01) D04H 3/02 (2006.01) D04H 3/03 (2006.01) D04H 3/16 (2006.01)
Patent
CA 2248451
A spunbonded material having improved tensile strength is made by (1) continuously extruding a propylene homopolymer or random propylene/ethylene copolymer having a melt flow rate of about 3 to about 30 g/10 min at a temperature above 500°F through a spinneret to form discrete filaments, (2) drawing the filaments to molecularly orient the polymer filaments, and (3) depositing the filaments in a substantially random manner onto a carrier belt to form a web. The propylene polymer contains an additives package that includes an organic phosphite, a hindered phenol compound, calcium stearate, and, optionally, a hydrotalcite compound.
Une matière filée-liée possédant une résistance à la traction améliorée est fabriquée : 1) en extrudant continuellement un homopolymère de propylène ou un copolymère statistique de propylène et d'éthylène, ayant une vitesse de fluage allant d'environ 3 à environ 30 g/10 min à une température supérieure à 500 .degré.F, à travers une buse à filer afin de produire des filaments discontinus; 2) en étirant les filaments afin d'obtenir une orientation moléculaire du polymère; et 3) en déposant les filaments sur une courroie, de manière suffisamment aléatoire pour former un voile. Le polymère de propylène contient un ensemble d'additifs incluant un phosphite organique, un phénol stériquement encombré, du stéarate de calcium et, facultativement, un hydrotalcite.
Fetherstonhaugh & Co.
Montell North America Inc.
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